Abstract
The formation mechanism of the monoclinic ZrO2 phase at high temperature in the case of the contact between YSZ and CuO, which prevents the manufacturing of the copper-based anodes for solid oxide fuel cells has been studied. Based on the XRD and thermo-gravimetric data the following mechanism of the phase transformation, occurring in CuO-YSZ system, is proposed. At the temperatures higher than 900°C the oxygen ion is transferred from CuO to the oxygen vacancy of YSZ surface that leads to the yttrium migration inward the lattice. According to the phase diagram of YSZ, the monoclinic ZrO2 phase is formed in the region where the stabilizing additive is deficient. Based on the proposed mechanism it is suggested that the monoclinic phase should not be formed in the Cu2O-YSZ mixture in an inert atmosphere due to the higher bond energy between oxygen and copper in Cu2O in comparison with CuO.
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